72173056 has 40 divisors (see below), whose sum is σ = 146256264. Its totient is φ = 35573760.

The previous prime is 72173033. The next prime is 72173063. The reversal of 72173056 is 65037127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36411 + ... + 38341.

Almost surely, 2^72173056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 72173056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73128132).

72173056 is an abundant number, since it is smaller than the sum of its proper divisors (74083208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72173056 is an equidigital number, since it uses as much as digits as its factorization.

72173056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022 (or 2006 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 72173056 is about 8495.4726766673. The cubic root of 72173056 is about 416.3498043948.

The spelling of 72173056 in words is "seventy-two million, one hundred seventy-three thousand, fifty-six".